Bacterial and cellular membranes

Bacterial and cellular membranes are fundamental lipid bilayer structures that define the boundaries of cells and organelles, maintaining internal homeostasis and regulating the exchange of substances. In bacteria, the cytoplasmic membrane is a critical site for energy metabolism, cell wall synthesis, and nutrient transport, making it a primary target for several classes of antibiotics like polymyxins and lipopeptides (PubMed: 21248717). These drugs typically work by disrupting the physical integrity of the membrane, leading to leakage of essential ions and cell death (PubMed: 27337182). While bacterial membranes are the intended targets in treating infections, the structural similarities between bacterial and host (human) cellular membranes can lead to off-target effects and toxicity. For instance, drugs that lack sufficient selectivity may damage human kidney or nerve cells, resulting in significant safety concerns such as nephrotoxicity (PubMed: 24762475). Understanding the differences in lipid composition, such as the presence of cholesterol in eukaryotic membranes versus hopanoids or specific phospholipids in bacteria, is crucial for developing selective therapeutic agents (PubMed: 15105405).

Other names

Plasma membraneCytoplasmic membraneLipid bilayerCell envelopeBiological membrane

Disruption of membrane integrity through pore formation, depolarization, or detergent-like effects, leading to leakage of intracellular contents and cell death (PubMed: 21248717, PubMed: 27337182).